<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    img{
      width: 200px;
    }
    .active{
      color: red;
    }
  </style>
</head>
<body>
  <div id="app"></div>

  <template id="my-app">
    <h2 v-show="isShow">hello world</h2>

    <button @click="change">切换</button>
  </template>


  <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
  <script>
    const App = {
      template: '#my-app',
      data() {
        return {
          isShow: true
        }
      },
      methods: {
        change() {
          this.isShow = !this.isShow
        }
      }
    }

    Vue.createApp(App).mount('#app')
  </script>

</body>
</html>